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Update AttributedString+StyledMarkdown.swift #4

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60 changes: 47 additions & 13 deletions AttributedStringStyledMarkdown/AttributedString+StyledMarkdown.swift
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Original file line number Diff line number Diff line change
Expand Up @@ -2,7 +2,17 @@
// Created by Frank Rausch on 2021-11-15.
//

import SwiftUI
#if canImport(UIKit)
extension UIFont: @unchecked @retroactive Sendable {}
import UIKit
#elseif canImport(AppKit)
extension NSFont: @unchecked @retroactive Sendable {}
import AppKit
#endif

extension NSMutableParagraphStyle: @unchecked Sendable {}
extension NSParagraphStyle: @unchecked @retroactive Sendable {}

fileprivate enum MarkdownStyledBlock: Equatable {
case generic
Expand All @@ -17,38 +27,58 @@ fileprivate enum MarkdownStyledBlock: Equatable {
// MARK: -

extension AttributedString {

init(styledMarkdown markdownString: String, fontSize: CGFloat = UIFont.preferredFont(forTextStyle: .body).pointSize) throws {

var s = try AttributedString(markdown: markdownString, options: .init(allowsExtendedAttributes: true, interpretedSyntax: .full, failurePolicy: .returnPartiallyParsedIfPossible, languageCode: "en"), baseURL: nil)


#if canImport(UIKit)
typealias XFont = UIFont
#elseif canImport(AppKit)
typealias XFont = NSFont
#endif

init(styledMarkdown markdownString: String, fontSize: CGFloat = XFont.preferredFont(forTextStyle: .body).pointSize, baseURL: URL? = nil) throws {

XFont.preferredFont(forTextStyle: .body)

var s = try AttributedString(markdown: markdownString, options: .init(allowsExtendedAttributes: true, interpretedSyntax: .full, failurePolicy: .returnPartiallyParsedIfPossible), baseURL: baseURL)

// Looking at the AttributedString’s raw structure helps with understanding the following code.
print(s)

// Set base font and paragraph style for the whole string
s.font = .systemFont(ofSize: fontSize)
s.paragraphStyle = defaultParagraphStyle

// Will respect dark mode automatically
s.foregroundColor = .label
#if canImport(UIKit)
s.foregroundColor = Color(UIColor.label)
#elseif canImport(AppKit)
s.foregroundColor = Color(NSColor.labelColor)
#endif

// MARK: Inline Intents
let inlineIntents: [InlinePresentationIntent] = [.emphasized, .stronglyEmphasized, .code, .strikethrough, .softBreak, .lineBreak, .inlineHTML, .blockHTML]

for inlineIntent in inlineIntents {

var sourceAttributeContainer = AttributeContainer()
sourceAttributeContainer.inlinePresentationIntent = inlineIntent

var targetAttributeContainer = AttributeContainer()
switch inlineIntent {
case .emphasized:
targetAttributeContainer.font = .italicSystemFont(ofSize: fontSize)
#if canImport(UIKit)
targetAttributeContainer.font = UIFont.italicSystemFont(ofSize: fontSize)
#elseif canImport(AppKit)
targetAttributeContainer.font = NSFontManager.shared.convert(NSFont.systemFont(ofSize: fontSize), toHaveTrait: .italicFontMask)
#endif
case .stronglyEmphasized:
targetAttributeContainer.font = .systemFont(ofSize: fontSize, weight: .bold)
case .code:
targetAttributeContainer.font = .monospacedSystemFont(ofSize: fontSize, weight: .regular)
#if os(iOS)
targetAttributeContainer.backgroundColor = .secondarySystemBackground
#else
targetAttributeContainer.backgroundColor = Color.secondary.opacity(0.1)
#endif
case .strikethrough:
targetAttributeContainer.strikethroughStyle = .single
case .softBreak:
Expand Down Expand Up @@ -145,7 +175,11 @@ extension AttributedString {
s[intentRange].paragraphStyle = previousListID == currentListID ? listParagraphStyle : lastElementListParagraphStyle
case .blockquote:
s[intentRange].paragraphStyle = defaultParagraphStyle
s[intentRange].foregroundColor = .secondaryLabel
#if canImport(UIKit)
s[intentRange].foregroundColor = Color(UIColor.secondaryLabel)
#elseif canImport(AppKit)
s[intentRange].foregroundColor = Color(NSColor.secondaryLabelColor)
#endif
case .code:
s[intentRange].font = .monospacedSystemFont(ofSize: 13, weight: .regular)
s[intentRange].paragraphStyle = codeParagraphStyle
Expand Down